JPH0196547A - Method and instrument for measuring concentration of alcohol - Google Patents
Method and instrument for measuring concentration of alcoholInfo
- Publication number
- JPH0196547A JPH0196547A JP25422587A JP25422587A JPH0196547A JP H0196547 A JPH0196547 A JP H0196547A JP 25422587 A JP25422587 A JP 25422587A JP 25422587 A JP25422587 A JP 25422587A JP H0196547 A JPH0196547 A JP H0196547A
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- sensor
- carrier liquid
- cell
- measuring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 12
- 239000007788 liquid Substances 0.000 claims abstract description 50
- 239000004065 semiconductor Substances 0.000 claims abstract description 38
- 238000000855 fermentation Methods 0.000 claims abstract description 20
- 230000004151 fermentation Effects 0.000 claims abstract description 20
- 239000012528 membrane Substances 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims description 22
- 239000003085 diluting agent Substances 0.000 claims description 8
- 238000007865 diluting Methods 0.000 claims description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 abstract description 6
- 230000001681 protective effect Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- 235000013405 beer Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 235000013555 soy sauce Nutrition 0.000 description 2
- 235000021419 vinegar Nutrition 0.000 description 2
- 239000000052 vinegar Substances 0.000 description 2
- 235000013334 alcoholic beverage Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 235000013532 brandy Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、例えば、酒類、醤油、酢等の食品醸造におけ
る発酵液中のアルコール濃度を測定するのに好適な方法
及び装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and apparatus suitable for measuring the alcohol concentration in a fermentation liquid in the brewing of foods such as alcoholic beverages, soy sauce, and vinegar.
従来、醸造業界におけるアルコール濃度の測定は、特開
昭６０−１０７５５７号公報に示されるような浮ひよう
法あるいは酸化法により、一定時間毎に行ない、発酵原
液の供給速度の変更操作を行なっていた。Conventionally, alcohol concentration in the brewing industry has been measured at regular intervals by the floating method or oxidation method as shown in Japanese Patent Application Laid-Open No. 60-107557, and the feed rate of the fermentation stock solution is changed. Ta.
しかし、上記の方法では、測定結果を得るのに時間がか
かり、時々変化する発酵状態に的確に対処できず、均質
な製品を得ることが困難であった。However, with the above methods, it takes time to obtain measurement results, it is not possible to accurately deal with sometimes changing fermentation conditions, and it is difficult to obtain a homogeneous product.
また、最近酵素センサーを用いる方法も開発されている
が、高価であり酵素寿命が短いという難点がある。Additionally, a method using an enzyme sensor has recently been developed, but it has the drawbacks of being expensive and having a short enzyme life.
そこで本発明は、発酵液中のアルコール濃度を連続して
精度が高く、かつ経済的に測定する方法及びその装置を
提供することを目的としている。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method and an apparatus for continuously measuring the alcohol concentration in a fermentation liquid with high accuracy and economically.
上記目的達成のため、第１発明のアルコール濃度測定方
法は、５ｎｏ２を主成分とづる焼結体の内部に電極を備
えた感ガス半導体チップを、揮発性ガス透過膜を有する
防水構造のホルダーに内装し、これに防水構造の測定セ
ルを固設した半導体センサーを、一定温度に保持したキ
ャリア液中に配設し、５？！酵液等の測定液をキャリア
液で所定温度に希釈した侵、該測定セルへ供給し、該半
導体センサーの出力である電気信号を増幅器で増幅して
得るようにしたことを特徴とし、第２発明の測定装置は
、５ｎｏ２を主成分とする焼結体の内部に電極を備えた
感ガス半導体チップを、揮発性ガス透過膜を有する防水
構造のホ゛ルダーに内装し、これに防水構造の測定セル
を固設した半導体センサーを、キャリア液を所定の温度
に保持する電熱器を備えたキャリア液槽中に設け、測定
する発酵液をキャリア液で希釈して前記測定ヒルへ供給
するため発酵液供給ポンプと希釈液供給ポンプとを設け
、かつ該半導体センサーの出力を増幅する増幅器を設け
たことを特徴としている。In order to achieve the above object, the alcohol concentration measuring method of the first invention is such that a gas-sensitive semiconductor chip having an electrode inside a sintered body mainly composed of 5no2 is placed in a waterproof structure holder having a volatile gas permeable membrane. A semiconductor sensor with a waterproof measurement cell fixed inside the sensor is placed in a carrier liquid maintained at a constant temperature. ! The second method is characterized in that a measuring solution such as a fermentation liquid is diluted with a carrier liquid to a predetermined temperature, and is supplied to the measuring cell, and the electrical signal that is the output of the semiconductor sensor is amplified by an amplifier. The measuring device of the invention houses a gas-sensitive semiconductor chip with electrodes inside a sintered body mainly composed of 5NO2 in a waterproof structure holder having a volatile gas permeable membrane, and a waterproof measurement cell is attached to this holder. A semiconductor sensor with a fixed carrier liquid is installed in a carrier liquid tank equipped with an electric heater that maintains the carrier liquid at a predetermined temperature, and the fermentation liquid to be measured is diluted with the carrier liquid and supplied to the measurement hill. The present invention is characterized in that it includes a pump and a diluent supply pump, and an amplifier that amplifies the output of the semiconductor sensor.
以下、本発明の一実施例を図面に基づいて説明する。 Hereinafter, one embodiment of the present invention will be described based on the drawings.
第１図は本発明のアルコール濃度測定装置のフローシー
ト図で、キャリア液槽１には、キャリア液を所定のレベ
ルに保持する液面センサー２と、キャリア液を一定の温
度に保持するための温度セン＋Ｊ−３と電熱器４とを備
えた温度コントロール装置５と、アルコール濃度を測定
する半導体センサー６とが設けられている。FIG. 1 is a flow sheet diagram of the alcohol concentration measuring device of the present invention, in which a carrier liquid tank 1 includes a liquid level sensor 2 for keeping the carrier liquid at a predetermined level, and a liquid level sensor 2 for keeping the carrier liquid at a constant temperature. A temperature control device 5 including a temperature sensor +J-3 and an electric heater 4, and a semiconductor sensor 6 for measuring alcohol concentration are provided.
半導体センサー６の下部には防水構造の測定セルフが固
設され、該測定セルフには、発酵液を希釈するためにキ
ャリア液を供給する希釈液供給ポンプ８の配管９が接続
され、該配管９に発酵液供給ポンプ１０の配管１１と、
測定セルフ内の液を急速に排除するためのエアポンプ１
２の配管１３とが接続されており、さらに、測定セルフ
には、測定液を排出する配管１４が接続されている。A measuring cell with a waterproof structure is fixed at the bottom of the semiconductor sensor 6, and a pipe 9 of a diluent supply pump 8 that supplies a carrier liquid to dilute the fermentation liquid is connected to the measuring cell. and the piping 11 of the fermentation liquid supply pump 10,
Air pump 1 for rapidly expelling liquid in the measuring cell
Further, a pipe 14 for discharging the measurement liquid is connected to the measurement self.
また、半導体センサー６は、第２図乃至第４図に示され
るように、防水構造のホルダー１５の下端開口に、セン
サーセル１６を保護キャップ１７にて取付け、該保護キ
ャップ１７の下部に前記測定セルフを固設している。In addition, as shown in FIGS. 2 to 4, the semiconductor sensor 6 has a sensor cell 16 attached to the lower end opening of a holder 15 having a waterproof structure with a protective cap 17. There is a self-service station.
上記センサーセル１６は、チップ室１８に感ガス半導体
チップ１９を設けるとともに、チップ室１８の下面を、
感ガス半導体デツプ１９に近接して設けた揮発性ガス透
過膜２０で覆ったもので、感ガス半導体チップ１９は、
Ｓ ｎ Ｏ２を主成分とする焼結体で内部には、温度セ
ンサーチップ抵抗２１、ヒータコイル２２及び電極２３
が内臓されている。The sensor cell 16 includes a gas-sensitive semiconductor chip 19 in a chip chamber 18, and a lower surface of the chip chamber 18.
The gas-sensitive semiconductor chip 19 is covered with a volatile gas permeable film 20 provided close to the gas-sensitive semiconductor chip 19.
It is a sintered body whose main component is SnO2, and inside there is a temperature sensor chip resistor 21, a heater coil 22, and an electrode 23.
is contained inside.
また、セン畳ナーセル１６１ま、ホルダー１５のしルソ
ケット２４を介して半導体センサー６の外部に設けられ
た演算増幅器２５に接続されており、半導体センサー６
の電気信号をさらに増幅してメータ等に表示するように
出力端子２６に接続されている。The sensor nacelle 161 is also connected to an operational amplifier 25 provided outside the semiconductor sensor 6 via the socket 24 of the holder 15.
It is connected to an output terminal 26 so that the electrical signal is further amplified and displayed on a meter or the like.
次にこのように構成された測定装置によるアルコール濃
度の測定方法を説明すると、キャリア液槽１内にキャリ
ア液として例えば水道水を入れ、電熱２Ｓ４にて加熱し
て３０℃程度の一定温度に保持し、半導体センサー６の
測定セルフに、希釈液供給ポンプ８と発酵液供給ポンプ
１０とを作動して発酵液等の測定液をキャリア液にて１
０〜３０倍程度の所定の８１度に希釈して供給する。Next, to explain the method of measuring alcohol concentration using the measuring device configured as described above, for example, tap water is poured as a carrier liquid into the carrier liquid tank 1, heated with electric heating 2S4, and maintained at a constant temperature of about 30°C. Then, in the measurement self of the semiconductor sensor 6, the diluent supply pump 8 and the fermentation solution supply pump 10 are operated to supply the measurement solution such as fermentation solution with the carrier solution.
It is diluted to a predetermined 81 degrees, which is about 0 to 30 times, and supplied.
半導体センサー６では、揮発性ガス透過膜２０によりチ
ップ室１８内に希釈液が侵入せず、希釈液中のアルコー
ル濃度に対応した蒸気がチップ室１８内に拡散し、この
蒸気を感ガス半導体チップ１９で検知し、その電気信号
を増幅器２５で増幅して測定液中のアルコール濃度をメ
ータ等に表示する。In the semiconductor sensor 6, the volatile gas permeable membrane 20 prevents the diluent from entering the chip chamber 18, and vapor corresponding to the alcohol concentration in the diluent diffuses into the chip chamber 18, and this vapor is transferred to the gas-sensitive semiconductor chip. 19, the electrical signal is amplified by an amplifier 25, and the alcohol concentration in the measurement liquid is displayed on a meter or the like.
また、アルコール濃度の状態によって発酵槽への原料の
供給速成を制御する等、発酵の自動制御を行う場合は、
出力端子２６からコンピュータに接続して情報を得れば
よい。In addition, when automatically controlling fermentation, such as controlling the speed of supply of raw materials to the fermenter depending on the state of alcohol concentration,
Information can be obtained by connecting to a computer from the output terminal 26.
尚、別の液を測定する場合は、エアポンプ１２を作動さ
せて測定セルフ内の溶液を急速に排除し、希釈液即ち水
蒸気の状態を０点に初期設定してから行う。If another liquid is to be measured, the air pump 12 is operated to quickly remove the solution in the measuring cell, and the state of the diluent liquid, that is, water vapor, is initialized to zero.
第５図は、上記の測定装置によって各種の測定液を測定
した結果を示すもので、先ず、所定の濃度を有するエタ
ノール水溶液Ａ１．Ａ２．Ａ３゜Ａ４．Ａ５を測定して
それぞれの出力をプロットした。次いで、これを標準と
してビール等の各測定液を測定したところ、それぞれの
アルコール濃度は、ビール−４，３０％、酢＝２．０％
９日本酒（４倍希釈）＝３．３０％、醤油＝１．５５％
。FIG. 5 shows the results of measuring various measurement liquids using the above measuring device. First, ethanol aqueous solution A1 having a predetermined concentration. A2. A3゜A4. A5 was measured and the respective outputs were plotted. Next, using this as a standard, each measurement liquid such as beer was measured, and the alcohol concentration of each was 4.30% for beer and 2.0% for vinegar.
9 Sake (4 times diluted) = 3.30%, soy sauce = 1.55%
.
ブランデー（１０倍希釈）−３，４６％のデータが得ら
れた。これらの値は従来法での測定結果とほとんど差が
なく、十分信頼できる値であることが分った。Brandy (10 times diluted) - data of 3,46% was obtained. These values showed almost no difference from the measurement results using the conventional method, and were found to be sufficiently reliable values.
本発明に係るアルコールｉｉ１度測定方法及び装置は以
上のように、ＳｎＯ２を主成分とする焼結体の内部に電
極を備えた感ガス半導体チップを、揮発性ガス透過膜を
有する防水構造のホルダーに内装し、これに防水構造の
測定セルを固設した半導体センサーを、一定温度に保持
したキャリア液中に配設し、発酵液等の測定液をキャリ
ア液で所定濃度に希釈した後、該測定セルへ供給し、該
半導体センサーの出力である電気信号を増幅器で増幅し
て得るようにしたので、測定結果が連続して迅速に得ら
れて発酵の管理が容易となり、また、醸造装置等に簡便
に付設して自動発酵制御にも使用でき、安価で保守が容
易である。さらに、希釈した測定液を測定するので、他
の香気成分等の影響を受けず精度の高いデータが得られ
る。As described above, the alcohol II 1 degree measuring method and device according to the present invention is such that a gas-sensitive semiconductor chip having an electrode inside a sintered body mainly composed of SnO2 is placed in a waterproof structure holder having a volatile gas permeable membrane. A semiconductor sensor with a waterproof measurement cell fixed therein is placed in a carrier liquid maintained at a constant temperature. After diluting the measurement liquid such as fermentation liquid to a predetermined concentration with the carrier liquid, Since the electrical signal that is the output of the semiconductor sensor is supplied to the measurement cell and amplified using an amplifier, measurement results can be obtained quickly and continuously, making it easier to manage fermentation. It can be easily attached to a machine and used for automatic fermentation control, and is inexpensive and easy to maintain. Furthermore, since the diluted measurement liquid is measured, highly accurate data can be obtained without being affected by other aroma components.
図は本発明の一実施例を示すもので、第１図はアルコー
ル濃度測定装置のフローシート図、第２図は半導体セン
サーの一部所面正面図、第３図は半導体センサーの要部
の断面図、第４図は半導体セン９゛−の回路図、第５図
は実験結果を示すグラフ図である。
１・・・キャリア液槽 ４・・・電熱器 ６・・・
半導体センサー ７・・・測定セル ８・・・希釈
液供給ポンプ １０・・・発酵液供給ポンプ １５
・・・ホルダー １９・・・感ガス半導体センサー
２０・・・揮発性ガス透過膜 ２３・・・電極
２５・・・増幅器
特 許 出 願 人 食品産業バイオリアクターシステ
ム技術研究組合
カ２巳
旦The figures show one embodiment of the present invention, in which Fig. 1 is a flow sheet diagram of an alcohol concentration measuring device, Fig. 2 is a partial front view of a semiconductor sensor, and Fig. 3 is a main part of a semiconductor sensor. 4 is a circuit diagram of the semiconductor sensor 9'-, and FIG. 5 is a graph showing experimental results. 1...Carrier liquid tank 4...Electric heater 6...
Semiconductor sensor 7... Measuring cell 8... Diluent supply pump 10... Fermentation solution supply pump 15
...Holder 19...Gas-sensitive semiconductor sensor
20... Volatile gas permeable membrane 23... Electrode
25...Amplifier patent applicant Food industry bioreactor system technology research association Ka2 Midan
Claims (1)
えた感ガス半導体チップを、揮発性ガス透過膜を有する
防水構造のホルダーに内装し、これに防水構造の測定セ
ルを固設した半導体センサーを、一定温度に保持したキ
ャリア液中に配設し、発酵液等の測定液をキャリア液で
所定濃度に希釈した後、該測定セルへ供給し、該半導体
センサーの出力である電気信号を増幅器で増幅して得る
ようにしたことを特徴とするアルコール濃度測定方法。 ２、ＳｎＯ＿２を主成分とする焼結体の内部に電極を備
えた感ガス半導体チップを、揮発性ガス透過膜を有する
防水構造のホルダーに内装し、これに防水構造の測定セ
ルを固設した半導体センサーを、キャリア液を所定の温
度に保持する電熱器を備えたキャリア液槽中に設け、測
定する発酵液をキャリア液で希釈して前記測定セルへ供
給するため発酵液供給ポンプと希釈液供給ポンプとを設
け、かつ該半導体センサーの出力を増幅する増幅器を設
けたことを特徴とするアルコール濃度測定装置。[Claims] 1. A gas-sensitive semiconductor chip with electrodes inside a sintered body mainly composed of SnO_2 is housed in a waterproof structure holder having a volatile gas permeable membrane, and a waterproof structure is attached to the holder. A semiconductor sensor with a fixed measurement cell is placed in a carrier liquid maintained at a constant temperature, and after diluting a measurement liquid such as fermentation liquid to a predetermined concentration with the carrier liquid, it is supplied to the measurement cell, and the semiconductor sensor A method for measuring alcohol concentration, characterized in that an electrical signal, which is the output of 2. A gas-sensitive semiconductor chip with electrodes inside a sintered body mainly composed of SnO_2 was placed in a waterproof holder with a volatile gas permeable membrane, and a waterproof measurement cell was fixed to this. A semiconductor sensor is installed in a carrier liquid tank equipped with an electric heater that maintains the carrier liquid at a predetermined temperature, and a fermentation liquid supply pump and diluent are installed to dilute the fermentation liquid to be measured with the carrier liquid and supply it to the measurement cell. 1. An alcohol concentration measuring device comprising: a supply pump; and an amplifier for amplifying the output of the semiconductor sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25422587A JPH0623708B2 (en) | 1987-10-08 | 1987-10-08 | Method and apparatus for measuring alcohol concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25422587A JPH0623708B2 (en) | 1987-10-08 | 1987-10-08 | Method and apparatus for measuring alcohol concentration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0196547A true JPH0196547A (en) | 1989-04-14 |
| JPH0623708B2 JPH0623708B2 (en) | 1994-03-30 |
Family
ID=17262001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25422587A Expired - Lifetime JPH0623708B2 (en) | 1987-10-08 | 1987-10-08 | Method and apparatus for measuring alcohol concentration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0623708B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008155279A1 (en) * | 2007-06-18 | 2008-12-24 | Siemens Aktiengesellschaft | Sterilizable sensor for monitoring biochemical processes in fermenters |
| AT514148B1 (en) * | 2013-04-03 | 2015-02-15 | Salm O & Co Gmbh | Apparatus and method for heating a fermentable raw material for beverage production |
| CN105021664A (en) * | 2015-08-13 | 2015-11-04 | 上海金枫酒业股份有限公司 | Online monitoring device and method for large pot rice wine storage |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11603305B2 (en) * | 2019-01-10 | 2023-03-14 | Alfa Laval Copenhagen A/S | Unit for dispensing ultra-high gravity beers on draft |
-
1987
- 1987-10-08 JP JP25422587A patent/JPH0623708B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008155279A1 (en) * | 2007-06-18 | 2008-12-24 | Siemens Aktiengesellschaft | Sterilizable sensor for monitoring biochemical processes in fermenters |
| AT514148B1 (en) * | 2013-04-03 | 2015-02-15 | Salm O & Co Gmbh | Apparatus and method for heating a fermentable raw material for beverage production |
| CN105021664A (en) * | 2015-08-13 | 2015-11-04 | 上海金枫酒业股份有限公司 | Online monitoring device and method for large pot rice wine storage |
| CN105021664B (en) * | 2015-08-13 | 2018-03-20 | 上海金枫酒业股份有限公司 | A kind of method that early warning yellow rice wine will become sour during yellow rice wine big pot storage |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0623708B2 (en) | 1994-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2223607C (en) | Breath testing apparatus | |
| Lyman et al. | Determination of picogram amounts of ATP using the luciferin-luciferase enzyme system | |
| JP2634699B2 (en) | Measurement Temperature Correction Method for Biosensing Meter | |
| GB1480762A (en) | Measurement of concentration of substrates | |
| CN202204797U (en) | Blood sugar detection instrument | |
| CN111398386A (en) | Immobilized enzyme electrode, immobilized enzyme sensor and enzyme membrane anti-interference detection method thereof | |
| US5204262A (en) | Ethanol sensor for computerized fermentation control | |
| Llenado et al. | Ion-electrode based automatic glucose analysis system | |
| JPH0196547A (en) | Method and instrument for measuring concentration of alcohol | |
| JPH052306B2 (en) | ||
| US4376681A (en) | Method of measuring carbon dioxide in a liquid or gas | |
| Willey et al. | Membrane‐covered electrode for measurement of oxygen concentration in soil | |
| JP2690053B2 (en) | Biosensor | |
| Horie et al. | Quality evaluation on green tea | |
| JPH08136498A (en) | Portable bod measuring apparatus | |
| 渡辺悦生 et al. | Determination of glucose in fish muscle and serum with an enzyme sensor. | |
| JPH10174599A (en) | Quantitative method for histamine and its apparatus | |
| CN216870449U (en) | Ion analyzer for detecting fluoride in waste water based on ion selective electrode method | |
| JPH0582903B2 (en) | ||
| JPS63101744A (en) | Assay apparatus for component in liquid | |
| Van Strien | Direct measurement of the oxidation-reduction condition of wort and beer | |
| JPS61265560A (en) | Ethanol sensor | |
| JPH06174691A (en) | Voltage-measuring circuit | |
| JPS5836736B2 (en) | Volatile substance measurement method | |
| JPS62277548A (en) | Ethanol sensor |